uniapp android app 铃声静音，真正的免打扰

需要加入这个权限：

<uses-permission android:name=\"android.permission.ACCESS_NOTIFICATION_POLICY\"/>

代码：

        /**
 * 设置铃声为静音，媒体音量不变(免打扰)
 * */
setDisturb()
{
    // #ifdef APP-PLUS
    var pf = uni.getSystemInfoSync().platform;
    if (pf == "android")
    {
        let AudioManager = plus.android.importClass('android.media.AudioManager');
        let Settings = plus.android.importClass('android.provider.Settings');
        let Intent = plus.android.importClass('android.content.Intent');
        let NotificationManager = plus.android.importClass('android.app.NotificationManager');
        let Context = plus.android.importClass('android.content.Context');
 
        let main = plus.android.runtimeMainActivity();
 
        this.audioManager = main.getSystemService(Context.AUDIO_SERVICE);
 
        if (this.audioManager == null)
        {
            return;
        }
        //console.log(AudioManager.RINGER_MODE_SILENT);//0
        //console.log(AudioManager.RINGER_MODE_NORMAL);//2
        //console.log(AudioManager.RINGER_MODE_VIBRATE);//1
 
        let n = main.getSystemService(Context.NOTIFICATION_SERVICE);
 
        if (n == null)
        {
            console.log("n is null");
            return;
        }
//授权
        if (n.isNotificationPolicyAccessGranted())
        {
            this.audioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
            uni.showToast(
            {
                title: '已为您开起免打扰模式。',
                duration: 3000,
                icon: 'none',
                mask: false
            });
        }
        else
        {
            uni.showToast(
            {
                title: '稍后，请授予此应用免打扰权限，然后请再按一次以开启免打扰。',
                duration: 4500,
                icon: 'none',
                mask: false
            });
 
            setTimeout(function()
            {
                let intent = new Intent(Settings.ACTION_NOTIFICATION_POLICY_ACCESS_SETTINGS);
                main.startActivity(intent);
            }, 4500);
        }
 
        this.audioManager.setRingerMode(AudioManager.RINGER_MODE_SILENT);
        var n1 = this.audioManager.getRingerMode()
    }
   
 
    // #endif
},